// https://syzkaller.appspot.com/bug?id=474b770699dcb3d34227402eec8317323009af19
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdio.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;

  size_t i;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (uint16_t)data[length - 1];

  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

static void execute_one();
extern unsigned long long procid;

static void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      execute_one();
      doexit(0);
    }

    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid) {
        break;
      }
      usleep(1000);
      if (current_time_ms() - start < 3 * 1000)
        continue;
      kill(-pid, SIGKILL);
      kill(pid, SIGKILL);
      while (waitpid(-1, &status, __WALL) != pid) {
      }
      break;
    }
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
void execute_one()
{
  long res = 0;
  res = syscall(__NR_socket, 0x11, 0x100000803, 0);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x200001c0, "/dev/net/tun", 13);
  res = syz_open_dev(0x200001c0, 0, 0x20000000002);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x20000040,
         "\x69\x66\x62\x30\x00\xfa\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00",
         16);
  *(uint16_t*)0x20000050 = 0x5001;
  syscall(__NR_ioctl, r[1], 0x400454ca, 0x20000040);
  memcpy((void*)0x20000000,
         "\x69\x66\x62\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         16);
  *(uint16_t*)0x20000010 = 0xa201;
  syscall(__NR_ioctl, r[0], 0x8914, 0x20000000);
  *(uint8_t*)0x20000480 = -1;
  *(uint8_t*)0x20000481 = 0;
  *(uint16_t*)0x20000482 = 0;
  *(uint16_t*)0x20000484 = 0;
  *(uint16_t*)0x20000486 = 0;
  *(uint16_t*)0x20000488 = 0;
  STORE_BY_BITMASK(uint8_t, 0x2000048a, 6, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000048a, 6, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000048b, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x2000048b, 0, 2, 6);
  *(uint16_t*)0x2000048c = htobe16(0x1c);
  *(uint16_t*)0x2000048e = htobe16(0);
  *(uint16_t*)0x20000490 = htobe16(0);
  *(uint8_t*)0x20000492 = 0;
  *(uint8_t*)0x20000493 = 0;
  *(uint16_t*)0x20000494 = 0;
  *(uint32_t*)0x20000496 = htobe32(0);
  *(uint32_t*)0x2000049a = htobe32(0xe0000001);
  *(uint8_t*)0x2000049e = 0;
  *(uint8_t*)0x2000049f = 0;
  *(uint16_t*)0x200004a0 = 0;
  *(uint32_t*)0x200004a2 = htobe32(0xe0000001);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x2000049e, 8);
  *(uint16_t*)0x200004a0 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x2000048a, 20);
  *(uint16_t*)0x20000494 = csum_inet_digest(&csum_2);
  syscall(__NR_write, r[1], 0x20000480, 0xfdef);
  res = syscall(__NR_socket, 0xa, 1, 0);
  if (res != -1)
    r[2] = res;
  memcpy((void*)0x20000000, "\x00\x00\xce\x9d\x26\xde\x00\x13\x09\x59\x3a\xb0"
                            "\xbb\xec\xd7\x54\x01\x00\x00\x00\x02",
         21);
  syscall(__NR_ioctl, -1, 0xc020660b, 0x20000000);
  syscall(__NR_ioctl, r[2], 0x8916, 0x20000000);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (;;) {
    loop();
  }
}